drivers/acpi/battery.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   4  *
   5  *  Copyright (C) 2007 Alexey Starikovskiy <[email protected]>
   6  *  Copyright (C) 2004-2007 Vladimir Lebedev <[email protected]>
   7  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   8  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   9  */
  10
  11 #define pr_fmt(fmt) "ACPI: battery: " fmt
  12
  13 #include <linux/delay.h>
  14 #include <linux/dmi.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/slab.h>
  21 #include <linux/suspend.h>
  22 #include <linux/types.h>
  23
  24 #include <asm/unaligned.h>
  25
  26 #include <linux/acpi.h>
  27 #include <linux/power_supply.h>
  28
  29 #include <acpi/battery.h>
  30
  31 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  32 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \
  33         ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
  34
  35 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  36
  37 /* Battery power unit: 0 means mW, 1 means mA */
  38 #define ACPI_BATTERY_POWER_UNIT_MA      1
  39
  40 #define ACPI_BATTERY_STATE_DISCHARGING          0x1
  41 #define ACPI_BATTERY_STATE_CHARGING             0x2
  42 #define ACPI_BATTERY_STATE_CRITICAL             0x4
  43 #define ACPI_BATTERY_STATE_CHARGE_LIMITING      0x8
  44
  45 #define MAX_STRING_LENGTH       64
  46
  47 MODULE_AUTHOR("Paul Diefenbaugh");
  48 MODULE_AUTHOR("Alexey Starikovskiy <[email protected]>");
  49 MODULE_DESCRIPTION("ACPI Battery Driver");
  50 MODULE_LICENSE("GPL");
  51
  52 static int battery_bix_broken_package;
  53 static int battery_notification_delay_ms;
  54 static int battery_ac_is_broken;
  55 static unsigned int cache_time = 1000;
  56 module_param(cache_time, uint, 0644);
  57 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  58
  59 static const struct acpi_device_id battery_device_ids[] = {
  60         {"PNP0C0A", 0},
  61
  62         /* Microsoft Surface Go 3 */
  63         {"MSHW0146", 0},
  64
  65         {"", 0},
  66 };
  67
  68 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  69
  70 enum {
  71         ACPI_BATTERY_ALARM_PRESENT,
  72         ACPI_BATTERY_XINFO_PRESENT,
  73         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  74         /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
  75          * switches between mWh and mAh depending on whether the system
  76          * is running on battery or not.  When mAh is the unit, most
  77          * reported values are incorrect and need to be adjusted by
  78          * 10000/design_voltage.  Verified on x201, t410, t410s, and x220.
  79          * Pre-2010 and 2012 models appear to always report in mWh and
  80          * are thus unaffected (tested with t42, t61, t500, x200, x300,
  81          * and x230).  Also, in mid-2012 Lenovo issued a BIOS update for
  82          *  the 2011 models that fixes the issue (tested on x220 with a
  83          * post-1.29 BIOS), but as of Nov. 2012, no such update is
  84          * available for the 2010 models.
  85          */
  86         ACPI_BATTERY_QUIRK_THINKPAD_MAH,
  87         /* for batteries reporting current capacity with design capacity
  88          * on a full charge, but showing degradation in full charge cap.
  89          */
  90         ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
  91 };
  92
  93 struct acpi_battery {
  94         struct mutex lock;
  95         struct mutex sysfs_lock;
  96         struct power_supply *bat;
  97         struct power_supply_desc bat_desc;
  98         struct acpi_device *device;
  99         struct notifier_block pm_nb;
 100         struct list_head list;
 101         unsigned long update_time;
 102         int revision;
 103         int rate_now;
 104         int capacity_now;
 105         int voltage_now;
 106         int design_capacity;
 107         int full_charge_capacity;
 108         int technology;
 109         int design_voltage;
 110         int design_capacity_warning;
 111         int design_capacity_low;
 112         int cycle_count;
 113         int measurement_accuracy;
 114         int max_sampling_time;
 115         int min_sampling_time;
 116         int max_averaging_interval;
 117         int min_averaging_interval;
 118         int capacity_granularity_1;
 119         int capacity_granularity_2;
 120         int alarm;
 121         char model_number[MAX_STRING_LENGTH];
 122         char serial_number[MAX_STRING_LENGTH];
 123         char type[MAX_STRING_LENGTH];
 124         char oem_info[MAX_STRING_LENGTH];
 125         int state;
 126         int power_unit;
 127         unsigned long flags;
 128 };
 129
 130 #define to_acpi_battery(x) power_supply_get_drvdata(x)
 131
 132 static inline int acpi_battery_present(struct acpi_battery *battery)
 133 {
 134         return battery->device->status.battery_present;
 135 }
 136
 137 static int acpi_battery_technology(struct acpi_battery *battery)
 138 {
 139         if (!strcasecmp("NiCd", battery->type))
 140                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 141         if (!strcasecmp("NiMH", battery->type))
 142                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 143         if (!strcasecmp("LION", battery->type))
 144                 return POWER_SUPPLY_TECHNOLOGY_LION;
 145         if (!strncasecmp("LI-ION", battery->type, 6))
 146                 return POWER_SUPPLY_TECHNOLOGY_LION;
 147         if (!strcasecmp("LiP", battery->type))
 148                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 149         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 150 }
 151
 152 static int acpi_battery_get_state(struct acpi_battery *battery);
 153
 154 static int acpi_battery_is_charged(struct acpi_battery *battery)
 155 {
 156         /* charging, discharging, critical low or charge limited */
 157         if (battery->state != 0)
 158                 return 0;
 159
 160         /* battery not reporting charge */
 161         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 162             battery->capacity_now == 0)
 163                 return 0;
 164
 165         /* good batteries update full_charge as the batteries degrade */
 166         if (battery->full_charge_capacity == battery->capacity_now)
 167                 return 1;
 168
 169         /* fallback to using design values for broken batteries */
 170         if (battery->design_capacity <= battery->capacity_now)
 171                 return 1;
 172
 173         /* we don't do any sort of metric based on percentages */
 174         return 0;
 175 }
 176
 177 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
 178 {
 179         return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
 180                 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
 181                 battery->full_charge_capacity < battery->design_capacity;
 182 }
 183
 184 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
 185 {
 186         /*
 187          * Some devices wrongly report discharging if the battery's charge level
 188          * was above the device's start charging threshold atm the AC adapter
 189          * was plugged in and the device thus did not start a new charge cycle.
 190          */
 191         if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
 192             battery->rate_now == 0)
 193                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 194
 195         return POWER_SUPPLY_STATUS_DISCHARGING;
 196 }
 197
 198 static int acpi_battery_get_property(struct power_supply *psy,
 199                                      enum power_supply_property psp,
 200                                      union power_supply_propval *val)
 201 {
 202         int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
 203         struct acpi_battery *battery = to_acpi_battery(psy);
 204
 205         if (acpi_battery_present(battery)) {
 206                 /* run battery update only if it is present */
 207                 acpi_battery_get_state(battery);
 208         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 209                 return -ENODEV;
 210         switch (psp) {
 211         case POWER_SUPPLY_PROP_STATUS:
 212                 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
 213                         val->intval = acpi_battery_handle_discharging(battery);
 214                 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
 215                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 216                 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
 217                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 218                 else if (acpi_battery_is_charged(battery))
 219                         val->intval = POWER_SUPPLY_STATUS_FULL;
 220                 else
 221                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 222                 break;
 223         case POWER_SUPPLY_PROP_PRESENT:
 224                 val->intval = acpi_battery_present(battery);
 225                 break;
 226         case POWER_SUPPLY_PROP_TECHNOLOGY:
 227                 val->intval = acpi_battery_technology(battery);
 228                 break;
 229         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 230                 val->intval = battery->cycle_count;
 231                 break;
 232         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 233                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 234                         ret = -ENODEV;
 235                 else
 236                         val->intval = battery->design_voltage * 1000;
 237                 break;
 238         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 239                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 240                         ret = -ENODEV;
 241                 else
 242                         val->intval = battery->voltage_now * 1000;
 243                 break;
 244         case POWER_SUPPLY_PROP_CURRENT_NOW:
 245         case POWER_SUPPLY_PROP_POWER_NOW:
 246                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 247                         ret = -ENODEV;
 248                 else
 249                         val->intval = battery->rate_now * 1000;
 250                 break;
 251         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 252         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 253                 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
 254                         ret = -ENODEV;
 255                 else
 256                         val->intval = battery->design_capacity * 1000;
 257                 break;
 258         case POWER_SUPPLY_PROP_CHARGE_FULL:
 259         case POWER_SUPPLY_PROP_ENERGY_FULL:
 260                 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
 261                         ret = -ENODEV;
 262                 else
 263                         val->intval = battery->full_charge_capacity * 1000;
 264                 break;
 265         case POWER_SUPPLY_PROP_CHARGE_NOW:
 266         case POWER_SUPPLY_PROP_ENERGY_NOW:
 267                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 268                         ret = -ENODEV;
 269                 else
 270                         val->intval = battery->capacity_now * 1000;
 271                 break;
 272         case POWER_SUPPLY_PROP_CAPACITY:
 273                 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
 274                         full_capacity = battery->full_charge_capacity;
 275                 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
 276                         full_capacity = battery->design_capacity;
 277
 278                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 279                     full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 280                         ret = -ENODEV;
 281                 else
 282                         val->intval = battery->capacity_now * 100/
 283                                         full_capacity;
 284                 break;
 285         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 286                 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
 287                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 288                 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
 289                         (battery->capacity_now <= battery->alarm))
 290                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 291                 else if (acpi_battery_is_charged(battery))
 292                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 293                 else
 294                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 295                 break;
 296         case POWER_SUPPLY_PROP_MODEL_NAME:
 297                 val->strval = battery->model_number;
 298                 break;
 299         case POWER_SUPPLY_PROP_MANUFACTURER:
 300                 val->strval = battery->oem_info;
 301                 break;
 302         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 303                 val->strval = battery->serial_number;
 304                 break;
 305         default:
 306                 ret = -EINVAL;
 307         }
 308         return ret;
 309 }
 310
 311 static const enum power_supply_property charge_battery_props[] = {
 312         POWER_SUPPLY_PROP_STATUS,
 313         POWER_SUPPLY_PROP_PRESENT,
 314         POWER_SUPPLY_PROP_TECHNOLOGY,
 315         POWER_SUPPLY_PROP_CYCLE_COUNT,
 316         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 317         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 318         POWER_SUPPLY_PROP_CURRENT_NOW,
 319         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 320         POWER_SUPPLY_PROP_CHARGE_FULL,
 321         POWER_SUPPLY_PROP_CHARGE_NOW,
 322         POWER_SUPPLY_PROP_CAPACITY,
 323         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 324         POWER_SUPPLY_PROP_MODEL_NAME,
 325         POWER_SUPPLY_PROP_MANUFACTURER,
 326         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 327 };
 328
 329 static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
 330         POWER_SUPPLY_PROP_STATUS,
 331         POWER_SUPPLY_PROP_PRESENT,
 332         POWER_SUPPLY_PROP_TECHNOLOGY,
 333         POWER_SUPPLY_PROP_CYCLE_COUNT,
 334         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 335         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 336         POWER_SUPPLY_PROP_CURRENT_NOW,
 337         POWER_SUPPLY_PROP_CHARGE_NOW,
 338         POWER_SUPPLY_PROP_MODEL_NAME,
 339         POWER_SUPPLY_PROP_MANUFACTURER,
 340         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 341 };
 342
 343 static const enum power_supply_property energy_battery_props[] = {
 344         POWER_SUPPLY_PROP_STATUS,
 345         POWER_SUPPLY_PROP_PRESENT,
 346         POWER_SUPPLY_PROP_TECHNOLOGY,
 347         POWER_SUPPLY_PROP_CYCLE_COUNT,
 348         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 349         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 350         POWER_SUPPLY_PROP_POWER_NOW,
 351         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 352         POWER_SUPPLY_PROP_ENERGY_FULL,
 353         POWER_SUPPLY_PROP_ENERGY_NOW,
 354         POWER_SUPPLY_PROP_CAPACITY,
 355         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 356         POWER_SUPPLY_PROP_MODEL_NAME,
 357         POWER_SUPPLY_PROP_MANUFACTURER,
 358         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 359 };
 360
 361 static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
 362         POWER_SUPPLY_PROP_STATUS,
 363         POWER_SUPPLY_PROP_PRESENT,
 364         POWER_SUPPLY_PROP_TECHNOLOGY,
 365         POWER_SUPPLY_PROP_CYCLE_COUNT,
 366         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 367         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 368         POWER_SUPPLY_PROP_POWER_NOW,
 369         POWER_SUPPLY_PROP_ENERGY_NOW,
 370         POWER_SUPPLY_PROP_MODEL_NAME,
 371         POWER_SUPPLY_PROP_MANUFACTURER,
 372         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 373 };
 374
 375 /* Battery Management */
 376 struct acpi_offsets {
 377         size_t offset;          /* offset inside struct acpi_sbs_battery */
 378         u8 mode;                /* int or string? */
 379 };
 380
 381 static const struct acpi_offsets state_offsets[] = {
 382         {offsetof(struct acpi_battery, state), 0},
 383         {offsetof(struct acpi_battery, rate_now), 0},
 384         {offsetof(struct acpi_battery, capacity_now), 0},
 385         {offsetof(struct acpi_battery, voltage_now), 0},
 386 };
 387
 388 static const struct acpi_offsets info_offsets[] = {
 389         {offsetof(struct acpi_battery, power_unit), 0},
 390         {offsetof(struct acpi_battery, design_capacity), 0},
 391         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 392         {offsetof(struct acpi_battery, technology), 0},
 393         {offsetof(struct acpi_battery, design_voltage), 0},
 394         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 395         {offsetof(struct acpi_battery, design_capacity_low), 0},
 396         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 397         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 398         {offsetof(struct acpi_battery, model_number), 1},
 399         {offsetof(struct acpi_battery, serial_number), 1},
 400         {offsetof(struct acpi_battery, type), 1},
 401         {offsetof(struct acpi_battery, oem_info), 1},
 402 };
 403
 404 static const struct acpi_offsets extended_info_offsets[] = {
 405         {offsetof(struct acpi_battery, revision), 0},
 406         {offsetof(struct acpi_battery, power_unit), 0},
 407         {offsetof(struct acpi_battery, design_capacity), 0},
 408         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 409         {offsetof(struct acpi_battery, technology), 0},
 410         {offsetof(struct acpi_battery, design_voltage), 0},
 411         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 412         {offsetof(struct acpi_battery, design_capacity_low), 0},
 413         {offsetof(struct acpi_battery, cycle_count), 0},
 414         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 415         {offsetof(struct acpi_battery, max_sampling_time), 0},
 416         {offsetof(struct acpi_battery, min_sampling_time), 0},
 417         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 418         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 419         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 420         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 421         {offsetof(struct acpi_battery, model_number), 1},
 422         {offsetof(struct acpi_battery, serial_number), 1},
 423         {offsetof(struct acpi_battery, type), 1},
 424         {offsetof(struct acpi_battery, oem_info), 1},
 425 };
 426
 427 static int extract_package(struct acpi_battery *battery,
 428                            union acpi_object *package,
 429                            const struct acpi_offsets *offsets, int num)
 430 {
 431         int i;
 432         union acpi_object *element;
 433
 434         if (package->type != ACPI_TYPE_PACKAGE)
 435                 return -EFAULT;
 436         for (i = 0; i < num; ++i) {
 437                 if (package->package.count <= i)
 438                         return -EFAULT;
 439                 element = &package->package.elements[i];
 440                 if (offsets[i].mode) {
 441                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 442                         u32 len = MAX_STRING_LENGTH;
 443
 444                         switch (element->type) {
 445                         case ACPI_TYPE_BUFFER:
 446                                 if (len > element->buffer.length + 1)
 447                                         len = element->buffer.length + 1;
 448
 449                                 fallthrough;
 450                         case ACPI_TYPE_STRING:
 451                                 strscpy(ptr, element->string.pointer, len);
 452
 453                                 break;
 454                         case ACPI_TYPE_INTEGER:
 455                                 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
 456
 457                                 break;
 458                         default:
 459                                 *ptr = 0; /* don't have value */
 460                         }
 461                 } else {
 462                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 463                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 464                                 element->integer.value : -1;
 465                 }
 466         }
 467         return 0;
 468 }
 469
 470 static int acpi_battery_get_status(struct acpi_battery *battery)
 471 {
 472         if (acpi_bus_get_status(battery->device)) {
 473                 acpi_handle_info(battery->device->handle,
 474                                  "_STA evaluation failed\n");
 475                 return -ENODEV;
 476         }
 477         return 0;
 478 }
 479
 480
 481 static int extract_battery_info(const int use_bix,
 482                          struct acpi_battery *battery,
 483                          const struct acpi_buffer *buffer)
 484 {
 485         int result = -EFAULT;
 486
 487         if (use_bix && battery_bix_broken_package)
 488                 result = extract_package(battery, buffer->pointer,
 489                                 extended_info_offsets + 1,
 490                                 ARRAY_SIZE(extended_info_offsets) - 1);
 491         else if (use_bix)
 492                 result = extract_package(battery, buffer->pointer,
 493                                 extended_info_offsets,
 494                                 ARRAY_SIZE(extended_info_offsets));
 495         else
 496                 result = extract_package(battery, buffer->pointer,
 497                                 info_offsets, ARRAY_SIZE(info_offsets));
 498         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 499                 battery->full_charge_capacity = battery->design_capacity;
 500         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
 501             battery->power_unit && battery->design_voltage) {
 502                 battery->design_capacity = battery->design_capacity *
 503                     10000 / battery->design_voltage;
 504                 battery->full_charge_capacity = battery->full_charge_capacity *
 505                     10000 / battery->design_voltage;
 506                 battery->design_capacity_warning =
 507                     battery->design_capacity_warning *
 508                     10000 / battery->design_voltage;
 509                 /* Curiously, design_capacity_low, unlike the rest of them,
 510                  *  is correct.
 511                  */
 512                 /* capacity_granularity_* equal 1 on the systems tested, so
 513                  * it's impossible to tell if they would need an adjustment
 514                  * or not if their values were higher.
 515                  */
 516         }
 517         if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
 518             battery->capacity_now > battery->full_charge_capacity)
 519                 battery->capacity_now = battery->full_charge_capacity;
 520
 521         return result;
 522 }
 523
 524 static int acpi_battery_get_info(struct acpi_battery *battery)
 525 {
 526         const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 527         int use_bix;
 528         int result = -ENODEV;
 529
 530         if (!acpi_battery_present(battery))
 531                 return 0;
 532
 533
 534         for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
 535                 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 536                 acpi_status status = AE_ERROR;
 537
 538                 mutex_lock(&battery->lock);
 539                 status = acpi_evaluate_object(battery->device->handle,
 540                                               use_bix ? "_BIX":"_BIF",
 541                                               NULL, &buffer);
 542                 mutex_unlock(&battery->lock);
 543
 544                 if (ACPI_FAILURE(status)) {
 545                         acpi_handle_info(battery->device->handle,
 546                                          "%s evaluation failed: %s\n",
 547                                          use_bix ? "_BIX":"_BIF",
 548                                          acpi_format_exception(status));
 549                 } else {
 550                         result = extract_battery_info(use_bix,
 551                                                       battery,
 552                                                       &buffer);
 553
 554                         kfree(buffer.pointer);
 555                         break;
 556                 }
 557         }
 558
 559         if (!result && !use_bix && xinfo)
 560                 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
 561
 562         return result;
 563 }
 564
 565 static int acpi_battery_get_state(struct acpi_battery *battery)
 566 {
 567         int result = 0;
 568         acpi_status status = 0;
 569         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 570
 571         if (!acpi_battery_present(battery))
 572                 return 0;
 573
 574         if (battery->update_time &&
 575             time_before(jiffies, battery->update_time +
 576                         msecs_to_jiffies(cache_time)))
 577                 return 0;
 578
 579         mutex_lock(&battery->lock);
 580         status = acpi_evaluate_object(battery->device->handle, "_BST",
 581                                       NULL, &buffer);
 582         mutex_unlock(&battery->lock);
 583
 584         if (ACPI_FAILURE(status)) {
 585                 acpi_handle_info(battery->device->handle,
 586                                  "_BST evaluation failed: %s",
 587                                  acpi_format_exception(status));
 588                 return -ENODEV;
 589         }
 590
 591         result = extract_package(battery, buffer.pointer,
 592                                  state_offsets, ARRAY_SIZE(state_offsets));
 593         battery->update_time = jiffies;
 594         kfree(buffer.pointer);
 595
 596         /* For buggy DSDTs that report negative 16-bit values for either
 597          * charging or discharging current and/or report 0 as 65536
 598          * due to bad math.
 599          */
 600         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
 601                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
 602                 (s16)(battery->rate_now) < 0) {
 603                 battery->rate_now = abs((s16)battery->rate_now);
 604                 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
 605         }
 606
 607         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 608             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 609                 battery->capacity_now = (battery->capacity_now *
 610                                 battery->full_charge_capacity) / 100;
 611         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
 612             battery->power_unit && battery->design_voltage) {
 613                 battery->capacity_now = battery->capacity_now *
 614                     10000 / battery->design_voltage;
 615         }
 616         if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
 617             battery->capacity_now > battery->full_charge_capacity)
 618                 battery->capacity_now = battery->full_charge_capacity;
 619
 620         return result;
 621 }
 622
 623 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 624 {
 625         acpi_status status = 0;
 626
 627         if (!acpi_battery_present(battery) ||
 628             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 629                 return -ENODEV;
 630
 631         mutex_lock(&battery->lock);
 632         status = acpi_execute_simple_method(battery->device->handle, "_BTP",
 633                                             battery->alarm);
 634         mutex_unlock(&battery->lock);
 635
 636         if (ACPI_FAILURE(status))
 637                 return -ENODEV;
 638
 639         acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
 640                           battery->alarm);
 641
 642         return 0;
 643 }
 644
 645 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 646 {
 647         /* See if alarms are supported, and if so, set default */
 648         if (!acpi_has_method(battery->device->handle, "_BTP")) {
 649                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 650                 return 0;
 651         }
 652         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 653         if (!battery->alarm)
 654                 battery->alarm = battery->design_capacity_warning;
 655         return acpi_battery_set_alarm(battery);
 656 }
 657
 658 static ssize_t acpi_battery_alarm_show(struct device *dev,
 659                                         struct device_attribute *attr,
 660                                         char *buf)
 661 {
 662         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 663
 664         return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
 665 }
 666
 667 static ssize_t acpi_battery_alarm_store(struct device *dev,
 668                                         struct device_attribute *attr,
 669                                         const char *buf, size_t count)
 670 {
 671         unsigned long x;
 672         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 673
 674         if (sscanf(buf, "%lu\n", &x) == 1)
 675                 battery->alarm = x/1000;
 676         if (acpi_battery_present(battery))
 677                 acpi_battery_set_alarm(battery);
 678         return count;
 679 }
 680
 681 static struct device_attribute alarm_attr = {
 682         .attr = {.name = "alarm", .mode = 0644},
 683         .show = acpi_battery_alarm_show,
 684         .store = acpi_battery_alarm_store,
 685 };
 686
 687 static struct attribute *acpi_battery_attrs[] = {
 688         &alarm_attr.attr,
 689         NULL
 690 };
 691 ATTRIBUTE_GROUPS(acpi_battery);
 692
 693 /*
 694  * The Battery Hooking API
 695  *
 696  * This API is used inside other drivers that need to expose
 697  * platform-specific behaviour within the generic driver in a
 698  * generic way.
 699  *
 700  */
 701
 702 static LIST_HEAD(acpi_battery_list);
 703 static LIST_HEAD(battery_hook_list);
 704 static DEFINE_MUTEX(hook_mutex);
 705
 706 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
 707 {
 708         struct acpi_battery *battery;
 709         /*
 710          * In order to remove a hook, we first need to
 711          * de-register all the batteries that are registered.
 712          */
 713         if (lock)
 714                 mutex_lock(&hook_mutex);
 715         list_for_each_entry(battery, &acpi_battery_list, list) {
 716                 if (!hook->remove_battery(battery->bat, hook))
 717                         power_supply_changed(battery->bat);
 718         }
 719         list_del(&hook->list);
 720         if (lock)
 721                 mutex_unlock(&hook_mutex);
 722         pr_info("extension unregistered: %s\n", hook->name);
 723 }
 724
 725 void battery_hook_unregister(struct acpi_battery_hook *hook)
 726 {
 727         __battery_hook_unregister(hook, 1);
 728 }
 729 EXPORT_SYMBOL_GPL(battery_hook_unregister);
 730
 731 void battery_hook_register(struct acpi_battery_hook *hook)
 732 {
 733         struct acpi_battery *battery;
 734
 735         mutex_lock(&hook_mutex);
 736         INIT_LIST_HEAD(&hook->list);
 737         list_add(&hook->list, &battery_hook_list);
 738         /*
 739          * Now that the driver is registered, we need
 740          * to notify the hook that a battery is available
 741          * for each battery, so that the driver may add
 742          * its attributes.
 743          */
 744         list_for_each_entry(battery, &acpi_battery_list, list) {
 745                 if (hook->add_battery(battery->bat, hook)) {
 746                         /*
 747                          * If a add-battery returns non-zero,
 748                          * the registration of the extension has failed,
 749                          * and we will not add it to the list of loaded
 750                          * hooks.
 751                          */
 752                         pr_err("extension failed to load: %s", hook->name);
 753                         __battery_hook_unregister(hook, 0);
 754                         goto end;
 755                 }
 756
 757                 power_supply_changed(battery->bat);
 758         }
 759         pr_info("new extension: %s\n", hook->name);
 760 end:
 761         mutex_unlock(&hook_mutex);
 762 }
 763 EXPORT_SYMBOL_GPL(battery_hook_register);
 764
 765 static void devm_battery_hook_unregister(void *data)
 766 {
 767         struct acpi_battery_hook *hook = data;
 768
 769         battery_hook_unregister(hook);
 770 }
 771
 772 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
 773 {
 774         battery_hook_register(hook);
 775
 776         return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
 777 }
 778 EXPORT_SYMBOL_GPL(devm_battery_hook_register);
 779
 780 /*
 781  * This function gets called right after the battery sysfs
 782  * attributes have been added, so that the drivers that
 783  * define custom sysfs attributes can add their own.
 784  */
 785 static void battery_hook_add_battery(struct acpi_battery *battery)
 786 {
 787         struct acpi_battery_hook *hook_node, *tmp;
 788
 789         mutex_lock(&hook_mutex);
 790         INIT_LIST_HEAD(&battery->list);
 791         list_add(&battery->list, &acpi_battery_list);
 792         /*
 793          * Since we added a new battery to the list, we need to
 794          * iterate over the hooks and call add_battery for each
 795          * hook that was registered. This usually happens
 796          * when a battery gets hotplugged or initialized
 797          * during the battery module initialization.
 798          */
 799         list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
 800                 if (hook_node->add_battery(battery->bat, hook_node)) {
 801                         /*
 802                          * The notification of the extensions has failed, to
 803                          * prevent further errors we will unload the extension.
 804                          */
 805                         pr_err("error in extension, unloading: %s",
 806                                         hook_node->name);
 807                         __battery_hook_unregister(hook_node, 0);
 808                 }
 809         }
 810         mutex_unlock(&hook_mutex);
 811 }
 812
 813 static void battery_hook_remove_battery(struct acpi_battery *battery)
 814 {
 815         struct acpi_battery_hook *hook;
 816
 817         mutex_lock(&hook_mutex);
 818         /*
 819          * Before removing the hook, we need to remove all
 820          * custom attributes from the battery.
 821          */
 822         list_for_each_entry(hook, &battery_hook_list, list) {
 823                 hook->remove_battery(battery->bat, hook);
 824         }
 825         /* Then, just remove the battery from the list */
 826         list_del(&battery->list);
 827         mutex_unlock(&hook_mutex);
 828 }
 829
 830 static void __exit battery_hook_exit(void)
 831 {
 832         struct acpi_battery_hook *hook;
 833         struct acpi_battery_hook *ptr;
 834         /*
 835          * At this point, the acpi_bus_unregister_driver()
 836          * has called remove for all batteries. We just
 837          * need to remove the hooks.
 838          */
 839         list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
 840                 __battery_hook_unregister(hook, 1);
 841         }
 842         mutex_destroy(&hook_mutex);
 843 }
 844
 845 static int sysfs_add_battery(struct acpi_battery *battery)
 846 {
 847         struct power_supply_config psy_cfg = {
 848                 .drv_data = battery,
 849                 .attr_grp = acpi_battery_groups,
 850         };
 851         bool full_cap_broken = false;
 852
 853         if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
 854             !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
 855                 full_cap_broken = true;
 856
 857         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
 858                 if (full_cap_broken) {
 859                         battery->bat_desc.properties =
 860                             charge_battery_full_cap_broken_props;
 861                         battery->bat_desc.num_properties =
 862                             ARRAY_SIZE(charge_battery_full_cap_broken_props);
 863                 } else {
 864                         battery->bat_desc.properties = charge_battery_props;
 865                         battery->bat_desc.num_properties =
 866                             ARRAY_SIZE(charge_battery_props);
 867                 }
 868         } else {
 869                 if (full_cap_broken) {
 870                         battery->bat_desc.properties =
 871                             energy_battery_full_cap_broken_props;
 872                         battery->bat_desc.num_properties =
 873                             ARRAY_SIZE(energy_battery_full_cap_broken_props);
 874                 } else {
 875                         battery->bat_desc.properties = energy_battery_props;
 876                         battery->bat_desc.num_properties =
 877                             ARRAY_SIZE(energy_battery_props);
 878                 }
 879         }
 880
 881         battery->bat_desc.name = acpi_device_bid(battery->device);
 882         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 883         battery->bat_desc.get_property = acpi_battery_get_property;
 884
 885         battery->bat = power_supply_register_no_ws(&battery->device->dev,
 886                                 &battery->bat_desc, &psy_cfg);
 887
 888         if (IS_ERR(battery->bat)) {
 889                 int result = PTR_ERR(battery->bat);
 890
 891                 battery->bat = NULL;
 892                 return result;
 893         }
 894         battery_hook_add_battery(battery);
 895         return 0;
 896 }
 897
 898 static void sysfs_remove_battery(struct acpi_battery *battery)
 899 {
 900         mutex_lock(&battery->sysfs_lock);
 901         if (!battery->bat) {
 902                 mutex_unlock(&battery->sysfs_lock);
 903                 return;
 904         }
 905         battery_hook_remove_battery(battery);
 906         power_supply_unregister(battery->bat);
 907         battery->bat = NULL;
 908         mutex_unlock(&battery->sysfs_lock);
 909 }
 910
 911 static void find_battery(const struct dmi_header *dm, void *private)
 912 {
 913         struct acpi_battery *battery = (struct acpi_battery *)private;
 914         /* Note: the hardcoded offsets below have been extracted from
 915          * the source code of dmidecode.
 916          */
 917         if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
 918                 const u8 *dmi_data = (const u8 *)(dm + 1);
 919                 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
 920
 921                 if (dm->length >= 18)
 922                         dmi_capacity *= dmi_data[17];
 923                 if (battery->design_capacity * battery->design_voltage / 1000
 924                     != dmi_capacity &&
 925                     battery->design_capacity * 10 == dmi_capacity)
 926                         set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
 927                                 &battery->flags);
 928         }
 929 }
 930
 931 /*
 932  * According to the ACPI spec, some kinds of primary batteries can
 933  * report percentage battery remaining capacity directly to OS.
 934  * In this case, it reports the Last Full Charged Capacity == 100
 935  * and BatteryPresentRate == 0xFFFFFFFF.
 936  *
 937  * Now we found some battery reports percentage remaining capacity
 938  * even if it's rechargeable.
 939  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 940  *
 941  * Handle this correctly so that they won't break userspace.
 942  */
 943 static void acpi_battery_quirks(struct acpi_battery *battery)
 944 {
 945         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 946                 return;
 947
 948         if (battery->full_charge_capacity == 100 &&
 949                 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 950                 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
 951                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 952                 battery->full_charge_capacity = battery->design_capacity;
 953                 battery->capacity_now = (battery->capacity_now *
 954                                 battery->full_charge_capacity) / 100;
 955         }
 956
 957         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
 958                 return;
 959
 960         if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
 961                 const char *s;
 962
 963                 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
 964                 if (s && !strncasecmp(s, "ThinkPad", 8)) {
 965                         dmi_walk(find_battery, battery);
 966                         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
 967                                      &battery->flags) &&
 968                             battery->design_voltage) {
 969                                 battery->design_capacity =
 970                                     battery->design_capacity *
 971                                     10000 / battery->design_voltage;
 972                                 battery->full_charge_capacity =
 973                                     battery->full_charge_capacity *
 974                                     10000 / battery->design_voltage;
 975                                 battery->design_capacity_warning =
 976                                     battery->design_capacity_warning *
 977                                     10000 / battery->design_voltage;
 978                                 battery->capacity_now = battery->capacity_now *
 979                                     10000 / battery->design_voltage;
 980                         }
 981                 }
 982         }
 983
 984         if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
 985                 return;
 986
 987         if (acpi_battery_is_degraded(battery) &&
 988             battery->capacity_now > battery->full_charge_capacity) {
 989                 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
 990                 battery->capacity_now = battery->full_charge_capacity;
 991         }
 992 }
 993
 994 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
 995 {
 996         int result = acpi_battery_get_status(battery);
 997
 998         if (result)
 999                 return result;
1000
1001         if (!acpi_battery_present(battery)) {
1002                 sysfs_remove_battery(battery);
1003                 battery->update_time = 0;
1004                 return 0;
1005         }
1006
1007         if (resume)
1008                 return 0;
1009
1010         if (!battery->update_time) {
1011                 result = acpi_battery_get_info(battery);
1012                 if (result)
1013                         return result;
1014                 acpi_battery_init_alarm(battery);
1015         }
1016
1017         result = acpi_battery_get_state(battery);
1018         if (result)
1019                 return result;
1020         acpi_battery_quirks(battery);
1021
1022         if (!battery->bat) {
1023                 result = sysfs_add_battery(battery);
1024                 if (result)
1025                         return result;
1026         }
1027
1028         /*
1029          * Wakeup the system if battery is critical low
1030          * or lower than the alarm level
1031          */
1032         if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1033             (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1034              (battery->capacity_now <= battery->alarm)))
1035                 acpi_pm_wakeup_event(&battery->device->dev);
1036
1037         return result;
1038 }
1039
1040 static void acpi_battery_refresh(struct acpi_battery *battery)
1041 {
1042         int power_unit;
1043
1044         if (!battery->bat)
1045                 return;
1046
1047         power_unit = battery->power_unit;
1048
1049         acpi_battery_get_info(battery);
1050
1051         if (power_unit == battery->power_unit)
1052                 return;
1053
1054         /* The battery has changed its reporting units. */
1055         sysfs_remove_battery(battery);
1056         sysfs_add_battery(battery);
1057 }
1058
1059 /* Driver Interface */
1060 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1061 {
1062         struct acpi_device *device = data;
1063         struct acpi_battery *battery = acpi_driver_data(device);
1064         struct power_supply *old;
1065
1066         if (!battery)
1067                 return;
1068         old = battery->bat;
1069         /*
1070          * On Acer Aspire V5-573G notifications are sometimes triggered too
1071          * early. For example, when AC is unplugged and notification is
1072          * triggered, battery state is still reported as "Full", and changes to
1073          * "Discharging" only after short delay, without any notification.
1074          */
1075         if (battery_notification_delay_ms > 0)
1076                 msleep(battery_notification_delay_ms);
1077         if (event == ACPI_BATTERY_NOTIFY_INFO)
1078                 acpi_battery_refresh(battery);
1079         acpi_battery_update(battery, false);
1080         acpi_bus_generate_netlink_event(device->pnp.device_class,
1081                                         dev_name(&device->dev), event,
1082                                         acpi_battery_present(battery));
1083         acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1084         /* acpi_battery_update could remove power_supply object */
1085         if (old && battery->bat)
1086                 power_supply_changed(battery->bat);
1087 }
1088
1089 static int battery_notify(struct notifier_block *nb,
1090                                unsigned long mode, void *_unused)
1091 {
1092         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1093                                                     pm_nb);
1094         int result;
1095
1096         switch (mode) {
1097         case PM_POST_HIBERNATION:
1098         case PM_POST_SUSPEND:
1099                 if (!acpi_battery_present(battery))
1100                         return 0;
1101
1102                 if (battery->bat) {
1103                         acpi_battery_refresh(battery);
1104                 } else {
1105                         result = acpi_battery_get_info(battery);
1106                         if (result)
1107                                 return result;
1108
1109                         result = sysfs_add_battery(battery);
1110                         if (result)
1111                                 return result;
1112                 }
1113
1114                 acpi_battery_init_alarm(battery);
1115                 acpi_battery_get_state(battery);
1116                 break;
1117         }
1118
1119         return 0;
1120 }
1121
1122 static int __init
1123 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1124 {
1125         battery_bix_broken_package = 1;
1126         return 0;
1127 }
1128
1129 static int __init
1130 battery_notification_delay_quirk(const struct dmi_system_id *d)
1131 {
1132         battery_notification_delay_ms = 1000;
1133         return 0;
1134 }
1135
1136 static int __init
1137 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1138 {
1139         battery_ac_is_broken = 1;
1140         return 0;
1141 }
1142
1143 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1144         {
1145                 /* NEC LZ750/LS */
1146                 .callback = battery_bix_broken_package_quirk,
1147                 .matches = {
1148                         DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1149                         DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1150                 },
1151         },
1152         {
1153                 /* Acer Aspire V5-573G */
1154                 .callback = battery_notification_delay_quirk,
1155                 .matches = {
1156                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1157                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1158                 },
1159         },
1160         {
1161                 /* Point of View mobii wintab p800w */
1162                 .callback = battery_ac_is_broken_quirk,
1163                 .matches = {
1164                         DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1165                         DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1166                         DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1167                         /* Above matches are too generic, add bios-date match */
1168                         DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1169                 },
1170         },
1171         {
1172                 /* Microsoft Surface Go 3 */
1173                 .callback = battery_notification_delay_quirk,
1174                 .matches = {
1175                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1176                         DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1177                 },
1178         },
1179         {},
1180 };
1181
1182 /*
1183  * Some machines'(E,G Lenovo Z480) ECs are not stable
1184  * during boot up and this causes battery driver fails to be
1185  * probed due to failure of getting battery information
1186  * from EC sometimes. After several retries, the operation
1187  * may work. So add retry code here and 20ms sleep between
1188  * every retries.
1189  */
1190 static int acpi_battery_update_retry(struct acpi_battery *battery)
1191 {
1192         int retry, ret;
1193
1194         for (retry = 5; retry; retry--) {
1195                 ret = acpi_battery_update(battery, false);
1196                 if (!ret)
1197                         break;
1198
1199                 msleep(20);
1200         }
1201         return ret;
1202 }
1203
1204 static int acpi_battery_add(struct acpi_device *device)
1205 {
1206         int result = 0;
1207         struct acpi_battery *battery;
1208
1209         if (!device)
1210                 return -EINVAL;
1211
1212         if (device->dep_unmet)
1213                 return -EPROBE_DEFER;
1214
1215         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1216         if (!battery)
1217                 return -ENOMEM;
1218         battery->device = device;
1219         strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1220         strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1221         device->driver_data = battery;
1222         mutex_init(&battery->lock);
1223         mutex_init(&battery->sysfs_lock);
1224         if (acpi_has_method(battery->device->handle, "_BIX"))
1225                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1226
1227         result = acpi_battery_update_retry(battery);
1228         if (result)
1229                 goto fail;
1230
1231         pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1232                 device->status.battery_present ? "present" : "absent");
1233
1234         battery->pm_nb.notifier_call = battery_notify;
1235         register_pm_notifier(&battery->pm_nb);
1236
1237         device_init_wakeup(&device->dev, 1);
1238
1239         result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1240                                                  acpi_battery_notify, device);
1241         if (result)
1242                 goto fail_pm;
1243
1244         return 0;
1245
1246 fail_pm:
1247         device_init_wakeup(&device->dev, 0);
1248         unregister_pm_notifier(&battery->pm_nb);
1249 fail:
1250         sysfs_remove_battery(battery);
1251         mutex_destroy(&battery->lock);
1252         mutex_destroy(&battery->sysfs_lock);
1253         kfree(battery);
1254
1255         return result;
1256 }
1257
1258 static void acpi_battery_remove(struct acpi_device *device)
1259 {
1260         struct acpi_battery *battery;
1261
1262         if (!device || !acpi_driver_data(device))
1263                 return;
1264
1265         battery = acpi_driver_data(device);
1266
1267         acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
1268                                        acpi_battery_notify);
1269
1270         device_init_wakeup(&device->dev, 0);
1271         unregister_pm_notifier(&battery->pm_nb);
1272         sysfs_remove_battery(battery);
1273
1274         mutex_destroy(&battery->lock);
1275         mutex_destroy(&battery->sysfs_lock);
1276         kfree(battery);
1277 }
1278
1279 #ifdef CONFIG_PM_SLEEP
1280 /* this is needed to learn about changes made in suspended state */
1281 static int acpi_battery_resume(struct device *dev)
1282 {
1283         struct acpi_battery *battery;
1284
1285         if (!dev)
1286                 return -EINVAL;
1287
1288         battery = acpi_driver_data(to_acpi_device(dev));
1289         if (!battery)
1290                 return -EINVAL;
1291
1292         battery->update_time = 0;
1293         acpi_battery_update(battery, true);
1294         return 0;
1295 }
1296 #else
1297 #define acpi_battery_resume NULL
1298 #endif
1299
1300 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1301
1302 static struct acpi_driver acpi_battery_driver = {
1303         .name = "battery",
1304         .class = ACPI_BATTERY_CLASS,
1305         .ids = battery_device_ids,
1306         .ops = {
1307                 .add = acpi_battery_add,
1308                 .remove = acpi_battery_remove,
1309                 },
1310         .drv.pm = &acpi_battery_pm,
1311         .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1312 };
1313
1314 static int __init acpi_battery_init(void)
1315 {
1316         if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1317                 return -ENODEV;
1318
1319         dmi_check_system(bat_dmi_table);
1320
1321         return acpi_bus_register_driver(&acpi_battery_driver);
1322 }
1323
1324 static void __exit acpi_battery_exit(void)
1325 {
1326         acpi_bus_unregister_driver(&acpi_battery_driver);
1327         battery_hook_exit();
1328 }
1329
1330 module_init(acpi_battery_init);
1331 module_exit(acpi_battery_exit);